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DNA Structure and Replication

DNA Structure and Replication
DNA with a G-C content of 50% will melt at approximately

100 °C
70 °C
60°C
90 °C

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DNA Structure and Replication
E.coli DNA polymerases II and III lack

partially 5' → 3' endonuclease activity
5' → 3' endonuclease activity
5' → 3' exonuclease activity
partially 5' → 3' exonuclease activity

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DNA Structure and Replication
What is the IUPAC code for an A, C, T ambiguity in a nucleic acid sequence?

H
None of these
B
S

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DNA Structure and Replication
Overwinding or overtightening of DNA during replication is caused and removed by

Single stranded protein, DNAa
DNAa, gyrase
DNAb, gyrase
DNAb, DNA polymerase

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DNA Structure and Replication
Which polymerase is active in DNA repairing

Polymerase II
none of these
Polymerase I
Polymerase III

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DNA Structure and Replication
In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%?

Remains same
Can not be compared
Increases
Decreases

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